Well why would Egypt attack me for no reason as soon as I get a province on their border? They lose a new & potentially lucrative trade partner in exchange for opening a 2nd front with a powerful enemy (like I said, I had about 700 decent troops lead by a seasoned general defending my city, no plum target) bordering their core cities while the war on their other front (vs selucids and persians) isn't going so well. No player would do something that boneheaded, it just reeks of sloppy programming meant to put more more pressure on the player through AI ganging.